Human breast milk is the optimal source of nutrition for infants, providing all essential nutrients for growth. The WHO recommends exclusive breastfeeding for the first 6 months of life, and continued breastfeeding for at least 12 months. Breastfeeding directly feeds an infant from the female breast. The breast is made up of adipose tissue, connective tissue, and lobes that produce milk under the influence of hormones like prolactin and oxytocin. There are some medical conditions that contraindicate breastfeeding due to risks to infant health. Alternatives allow using breast milk when direct breastfeeding is not possible.